Hello! After installing this mod, a blue button with a "broken" gear will appear in the panel below.
After clicking on it, select the desired area with a frame while holding down the left mouse button and, in the window that appears, configure the necessary template parameters.
https://ibb.co.com/LX1GztCy
Ruins templates are saved in the AppData\Roaming\Factorio\script-output\ruins directory
Then make a copy of the mod https://mods.factorio.com/mod/AbandonedRuins-base. Rename it, edit the code and replace the existing templates with your own
You also need to install the main mod https://mods.factorio.com/mod/AbandonedRuins_updated_fork . Without it, the ruins will not work.
The original instructions from the mod author can be found at https://mods.factorio.com/mod/ruin-maker and https://mods.factorio.com/mod/AbandonedRuins